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The equation of the circle and its chord...

The equation of the circle and its chord are-respectively `x^2 + y^2 = a^2 and x cos alpha + y sin alpha = p`. The equation of the circle of which this chord isa diameter is

A

`x^(2)+y^(2) -px cos alpha -2py sin alpha + 2p^(2) -a^(2) =0`

B

`x^(2) +p^(2) -2px cos alpha - 2p y sin alpha + p^(2) -a^(2) =0`

C

`x^(2) + y^(2) +2px cos alpha + 2py sin alpha + 2p^(2) -a^(2) =0`

D

None of these

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The correct Answer is:
A
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